From 204e0a6b3e746dafb2812b7e6bdde2f068d1c9ec Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Tue, 14 Dec 2010 17:40:19 +0000
Subject: [PATCH] allow files of size 0

---
 src/fs/fs_download.c | 28 +++++++++++++++++++++++++++-
 src/fs/fs_tree.c     |  3 +--
 2 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/src/fs/fs_download.c b/src/fs/fs_download.c
index 6943f10b5..942a77eee 100644
--- a/src/fs/fs_download.c
+++ b/src/fs/fs_download.c
@@ -1839,9 +1839,35 @@ void
 GNUNET_FS_download_start_task_ (void *cls,
 				const struct GNUNET_SCHEDULER_TaskContext *tc)
 {
-  struct GNUNET_FS_DownloadContext *dc = cls;
+  struct GNUNET_FS_DownloadContext *dc = cls;  
+  struct GNUNET_FS_ProgressInfo pi;
+  struct GNUNET_DISK_FileHandle *fh;
 
   dc->start_task = GNUNET_SCHEDULER_NO_TASK;
+  if (dc->length == 0)
+    {
+      /* no bytes required! */
+      if (dc->filename != NULL) 
+	{
+	  fh = GNUNET_DISK_file_open (dc->filename != NULL 
+				      ? dc->filename 
+				      : dc->temp_filename, 
+				      GNUNET_DISK_OPEN_READWRITE | 
+				      GNUNET_DISK_OPEN_CREATE,
+				      GNUNET_DISK_PERM_USER_READ |
+				      GNUNET_DISK_PERM_USER_WRITE |
+				      GNUNET_DISK_PERM_GROUP_READ |
+				      GNUNET_DISK_PERM_OTHER_READ);
+	  GNUNET_DISK_file_close (fh);
+	}
+
+      pi.status = GNUNET_FS_STATUS_DOWNLOAD_COMPLETED;
+      GNUNET_FS_download_make_status_ (&pi, dc);
+      GNUNET_FS_download_sync_ (dc);
+       if (dc->parent != NULL)
+	check_completed (dc->parent);      
+      return;
+    }
   schedule_block_download (dc, 
 			   (dc->uri->type == chk) 
 			   ? &dc->uri->data.chk.chk
diff --git a/src/fs/fs_tree.c b/src/fs/fs_tree.c
index 211714b86..05c9c55cd 100644
--- a/src/fs/fs_tree.c
+++ b/src/fs/fs_tree.c
@@ -173,7 +173,6 @@ GNUNET_FS_tree_encoder_create (struct GNUNET_FS_Handle *h,
 {
   struct GNUNET_FS_TreeEncoder *te;
   
-  GNUNET_assert (size > 0);
   te = GNUNET_malloc (sizeof (struct GNUNET_FS_TreeEncoder));  
   te->h = h;
   te->size = size;
@@ -253,7 +252,7 @@ GNUNET_FS_tree_calculate_block_size (uint64_t fsize,
   uint64_t epos;
   unsigned int chks;
 
-  GNUNET_assert (offset < fsize);
+  GNUNET_assert (offset <= fsize);
   if (depth == totaldepth)
     {
       ret = DBLOCK_SIZE;
-- 
2.25.1